Articles containing non-fused aluminum oxide-based abrasive mineral
AssigneeMinnesota Mining and Manufacturing Company
InventorsMelvin A. Leitheiser, Harold G. Sowman
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Abstract
The invention relates to synthetic, non-fused, aluminum oxide-based abrasive mineral having a microcrystalline structure of randomly oriented crystallites comprising a dominant continuous phase of .alpha.-alumina and a secondary phase, to a method of making the same employing chemical ceramic technology, and to abrasive articles made with the abrasive mineral.
Claims18
An abrasive article containing granular abrasive mineral comprising substantially calcium ion- and alkali metal ion-free, dense, non-fused synthetic, aluminum oxide-based granular abrasive mineral, comprising a secondary phase of randomly oriented crystallites comprising modifying component in a dominant continuous alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from:
- (i) at least 10% of zirconia, hafnia, a combination of zirconia and hafnia, a combination of zirconia and samaria, or a combination of zirconia, hafnia and samaria;
- (ii) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, or a combination of said spinel with at least one of titania, ceria, or zirconia;
- (iii) 1-45% of said zirconia, hafnia, or the combination of zirconia and hafnia and at least 1% of said spinel.
An abrasive article containing granular abrasive mineral comprising substantially alkali metal ion free, dense, non-fused synthetic, aluminum oxide-based granular abrasive mineral, comprising a secondary phase of randomly oriented crystallites comprising modifying component in a dominant continuous alumina phase comprising alpha-alumina, said modifying component, on a volume percent of fired solids of the mineral, being selected from the group consisting of:
- (i) at least 10% of zirconia, hafnia, a combination of zirconia and hafnia, a combination of zirconia and samaria, or a combination of zirconia, hafnia and samaria.
- (ii) at least 1% of a spinel derived from alumina and at least one oxide of a metal selected from cobalt, nickel, zinc, or magnesium, or a combination of said spinel with at least one of titania, ceria, or zirconia;
- (iii) 1-45% of said zirconia, hafnia, or the combination of zirconia and hafnia and at least 1% of said spinel.
Dependencies are inferred from the claim text.